Although the causes of cancer ____we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering |
| C．are uncovering | D．have uncovered |
相关试题
In_________most countries, a university degree can give you________flying start in life.
| A．the; a | B．the; 不填 | C．不填; 不填 | D．不填; a |
—Here’s your change.
——_______________
| A．Thank you. | B．Don’t mention it. | C．No problem | D．With pleasure. |
On my desk is a photo that my father took ofwhen I was a baby.
| A． | him | B． | his | C． | me | D． | mine |
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